But for many, including Glen Gibson and his son Josh, sitting in one of these has a whole new meaning.

Gibson said, "I think being cautious is one perspective, living in fear is another."

At the Elvis Cinemas chain, sales were down over the weekend. They saw a drop of around 40 percent on Friday and 20 percent on Saturday. Owner Todd Tedford said, "I think it was the initial shock of what happened."

Tedford expects the movie industry to implement a new nationwide security plan. "They have companies that will put together programs and basically explain here's what you need to install to make it a safer place," he explained.

In the meantime, he is working on a plan of his own. "First would be we now have a police presence," he said.

While some people have stayed away from getting lost in Hollywood, Autumn Teff said now is the time to take her kids and their friends to the movies. "I have my own anxiety I guess, you know, but you can't live in fear," she said.

Other movie chains are also implementing changes. AMC will no longer let you wear costumes, face masks or bring toy weapons into its theaters.